How can tartar and plaque be removed from teeth without grinding? is there any paste, etc. for it?
The girders of a suspension bridge form an arc. The definition of an arc is a curve or bowed shape, like a part of a circle. An example of an arc is a rainbow. To arc is defined as to make a curved shape or move in a curved path.
arc. in geometry, a curved line or any part of it; in particular, a portion of the circumference of a circle. The length s of an arc of a circle of radius r and subtending a central angle of Î¸ radians is s = r Î¸; if Î¸ is measured in degrees, then the arc is given by s =2Ï r Î¸/360. in electricity, highly luminous and intensely hot discharge of electricity between two electrodes.